NCERT Class 9/Class 9 Science Chapter 3 Atoms and Molecules Sample Test,Sample questions

Question:
3.42 g of sucrose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution are

1. 6.68 × 1023

2.6.09 × 1022

3. 6.022 × 1023

4.6.022 × 102321


Question:
A change in the physical state can be brought about

1.only when energy is given to the system

2.only when energy is taken out from the system

3.when energy is either given to, or taken out from the system

4.without any energy change


Question:
How many times an atom of sulphur is heavier than an atom of carbon?

1.32 times

2.12 times

3. 8/3 times

4.12/32 times


Question:
Percentage of calcium in calcium carbonate is

1.40

2.30

3.48

4.36


Question:
The chemical symbol for nitrogen gas is

1.Ni

2.N2

3.N+

4. N


Question:
The chemical symbol for sodium is

1. So

2.Sd

3.NA

4.Na


Question:
The molecule having an atomicity of 4 is:

1.Sulphate molecule

2.Ozone molecule

3.Phosphorus molecule

4.Methane molecule


Question:
The number of oxygen atoms in 4.4 g of CO2 is approx.

1.6 × 1022

2. 6

3.12 × 1023

4.1.2 × 1023


Question:
The relative molecular mass of Na2S2O3.5H2O is

1.250 amu

2.250 g

3.248 amu

4.248 g


Question:
The value of Avogadro’s constant is:

1.6.0 × 1024

2.6.01 × 1022

3. 6.022 × 1023

4.6.022 × 10-23


Question:
What mass of carbon dioxide (CO2) will contain 3.011 × 1023 molecules?

1.11.0 g

2.22.0 g

3.4.4 g

4. 44.0 g


Question:
Which has maximum number of molecules?

1. 1 g of CO2

2.1 g of N2

3.1 g of H2

4.1 g of CH4


Question:
Which of the following correctly represents 360 g of water?
(i) 2 moles of H2O
(ii) 20 moles of water
(iii) 6.022 × 1023 molecules of water
(iv) 1.2044 × 1025 molecules of water

1. (i)

2.(i) and (iv)

3.(ii) and (iii)

4. (ii) and (iv)


Question:
Which of the following has maximum number of atom?

1.18 g H2O

2.18 g of O2

3.18 g of CO2

4.18 g of CH4


Question:
Which of the following has maximum number of atoms?

1.18 g of H2O

2.18 g of O2

3.18 g of CO2

4.18 g of CO4


Question:
Which of the following represents 12 u?

1.Mass of 1 hydrogen atom

2.Mass of C-12 atom

3.Mass of 0-16 atom

4.1/12th of mass of C-12 atom.


Question:
Which of the following would weigh the highest?

1.0.2 mole of sucrose (C12H22O11)

2.2 moles of CO2

3.2 moles of CaCO3

4.10 moles of H2O


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